Sand blast system



Nov. 1, 1932. E 1,885,760

r SAND BLAST SYSTEM Filed Oct. 31, 1929 2 Sheets-Sheet 2 ,INVENTOR. fag.) 1% Y ATTORNEY Patented Nov. 1, 1932 restate LOUIS :o. PEIK, or MISI-IAWAKA,'INDIANA, ASSIGNOB To THE Annnicnn ronnnnv EQUIPMENT ooMrAnY, or NEW YonK,

iv. Y. A coaronA ron or DELAWARE 'sann BLAST SYSTEM Application filed oetober snieae. Serial No. maesa, i

This invention relates to blasting apparatus, and more particularly, to a new and improved system for recovering and reconditioning abrasive material which has been 5 used in blasting, as for example, in the sand blasting of castings.

In carrying out the blasting operations it i accomplishedbydirecting asuitable air current over the abrasive material and causing the current to pick up the dust and finer particles and removing them from the abrasive Means is also 7 25 which it is desired to recover.

provided for preventing the air current from carrying away particles which are sufliciently large to be used forfurther blasting. r The invention provides moreisp'ecifically. a so transfer pan which is located below the hopper of the down-draft-room and is so vibrated as to cause the particles to move longitudi-.

- nally thereof and to fall ,onto'la suitable screen. A current of air is passed through .35

the falling particles, picks up the dust and certain of the ,fine rparticlesand carries the sameitoa dust chamber which is provided with suitable battles for so changing the di- I rection of the air current that the larger par- H ticles releaseand drop back onto the screen.

Means is also provided forregulating the amount of air which is drawn throu 'h the falling particles whereby the desired action 1 maybe obtained.

' and original features of construction and combinations of and claimed. g M I Although thenovel features which are be- The. present invention particularly propivotedlink22 and is oscillated by means of;

The invention also consists in certain new parts hereinafter set forth lieved to be characteristic of this invention 2 will be particularly pointed out in the clgi appended hereto, the invention itself, as [to its objects and advantages, the mode .of, its

operation and the manner of its organization may be better understood by referring to. the ;;;55

following description taken in connection with the accompanying drawings'forniinga part thereof, in which Y f l Fig, 1 is a side elevation of the down-draftroom and associated apparatus constructed go in'accordance with the present invention; j

1 Fig. 2 isa section taken on the line 2-2 of Fig. 1 showing the construction of the dust separation chamber and Fig. 3 is an enlarged detail view of the 5 mechanism for adjusting the air current.

Like reference characters denote like parts in the several figures of the drawings. 7

In the following description and in the claims parts, will be identified by specific- 70 names "for convenience,-but they are intended to be as generic in their'application to similar 1 parts as the art will permit. Q

Referring to the drawings more in detail the invention is shown-as applied to a downdraft-room 10 having a fioor 11 which is suitably perforated to permit the used abrasive.

material to pass therethroughinto a hopper .12; Floor 11 and hopper 12 may be supported over a pit 13 as by walls 14 to which they areso secured in any convenient manner. r

Hopper 12 terminates in a spout which -is mounted adjacent an oscillating transfer pan 21. Said pan may. be supported from cam 23 which is driven by a suitable motor 24:. Cam. 23, cooperates with a roller 25 mounted on lever 26 whichis 'pivot'ally secured to the motor support 27. Spring 28 is mounted between lever 27 and end plate'30 forming a part of transfer pan 21 and serves to hold stop member 31 secured 'inend plate against stopmember 32 which is attached to lever 26. l i A A pair of screens 35 are mounted on trans.- fer pan 21 in alignment with discharge opening 36-by suitable means, such aslinks 37. Said screens are preferably inclined and are vibratedtogether with transfer pan 21 whereby the coarse particles 'orltailings are sepa- 1 rated and discharged into a refuse can 38, whereas the desired abrasive material is passed through a screen into container 39. Transfer pan 21 is mounted in a slightly inclined position to assist in causing the necessary movement of the sand particles as will be later described.

Air duct 40 extends through transfer pan -;21 and is provided with an open end 41 which is mounted inproximity to opening 36 in said transfer pan and is adapted to receive air which passes through the particles of maj terial falling from said .pan onto screen 35. Duct 40 is provided with an extension 42' which may be controlled by damper 43 extendinginto hopper 12 Said duct communicates with a dust'removal chamber 45 which has associated therewith a stack or dischar e pipe 46. Chamber 45is extended horizontally whereby duct 40 and pipe 46 are slightly disj placed. A plurality of inclined bafiies 47 are mounted in chamber 45 in such positionthat air and dust particles which pass from duct 40 to pipe 46 are deflected downwardly. Dust chamber 45 extends downwardly below pipe 46 and communicates through port 48 to duct 40 fora purpose to be described. Any suitable blower or suction means may be employed for causing the desired air currents through down draft-room 10,-duct and dust removal chamber 45. a a

Adjusting plate 50 (Fig. 3) is mounted below transfer pan 21 adjacent opening 36 and is secured thereto by suitable means such as bolt 51 extending through an elongated slot 52 in said plate. Plate 50 projects toward end 41 of duct 40 and controls the extent of opening between the transfer pan and duct. Materials are also directed .by plate 50 onto screen 35. Said plate consequently controls both the discharge of 'materials onto screen 35 and the size of opening through which air may be drawn intoduct 40.

In the operation of the above described apparatus the material to be treated, such as rough castings, isplaced in the down-draftroom10 and a blast of abrasive material is' applied thereto. The used abrasive material then falls through"flo0r 11 into hopper 12 j and is discharged onto transfer pan 21. Pan

21 is oscillated due to'the action ofcam 23 insuch manner as to cause the abrasive particles to move longitudinally of said pan and to be discharged over plate 50 through open- .ing 36 ontoscreen 35.

As the pa rticles'fall onto said screen an air current is drawn t-herethroughinto duct '40 which picks up the fine particles an'ddust I and carries them into dust separation cham- 9 her 45. Damper 43 may be so regulated as to provide the necessary down draft in room 10 for eii'ecting the proper removal of the abrasive material.

In separation chamber 45 thea'ir currents pass between baffles 47 which deflect said ourssaveo rents downwardly and cause the larger particles to be deflected to the bottom of said chamber, where they again enter duct 40 through port 48. The air currents and the finer particles after passing between baflies 47 are removed upwardly through pipe 46. The coarser particles which re-enter duct 40 through port 48 are again subjected to the air currents whereby the finer dust is again picked up and the larger particles are allowed to drop back through duct 40 onto screen 35; The'coarse particles are discharged from said screen into container 38 and the desired abrasive material 'falls into container 39.

Whilecertain novelfeatures of theinven- Ytion' have been shown and described andare pointed out in the annexed claims, itwill be understood that various omissions, substitutions and changes in the forms and details of the device illustrated andin its opfor causing an air current to pass through the particles ofmaterial falling from said pan to said screen whereby the dust and finer particles are removed therefrom.

2. A blasting apparatus comprising a blasting chamberhaving a perforated floor,

a transfer pan mounted beneath said cham ber, a hopper for directing material from said chamber onto:sa1d pan, a screen assoclated wlth said pan means for causing abrasive material to move longitudinally of said pan and todrop onto said screen, an exhaust duct terminating adjacent said screen, means for causing an air current to pass through the particles of material falling from said pan to said screen whereby the dust and finer.

particles are removed therefrom, and means for controlling the opening of said duct whereby the amount of said air current may be varied.

3. A blasting apparatus comprisingl a blastingchamber having a perforated floor, v a transfer pan mounted beneath said chamber, a hopper for directing material from said chamber onto said pan, a screen associated with said pan, means for causing abrasive material-to move longltudlnally of said pan and to drop onto said screen,-an exhaust duct terminating ad acent said screen, means for causing an air current to pass through the particles of material falling from said. pan to said screen whereby the dust and finer particles are removed therefrom, and an adjustable member secured to said transfer pan for directing the material onto said screen in the path of said air current.

at. A blasting apparatus comprising a blasting chamber having a perforated floor, a transfer pan mounted beneath said chamber, a hopper for directing material from said chamber onto said pan, a screen associated with said pan, means for causing abrasive material to move longitudinally of said pan and to drop onto saidscreen, an exhaust duct terminating adjacent said screen, means for causing an air current to pass through the particles of material falling from said pan to said screen whereby the dust and finer particles are removed therefrom, and a separation chamber associated with said duct and having means therein for removing the larger particles and returning said particles to said duct.

5. A. blasting apparatus comprising a blastingchamber having aper'forated floor, a transfer pan mounted beneath said chamber, a hopper for directing material from said chamber onto said pan, a screen associated with said pan, means for causing abrasive material to move longitudinally of said pan and to drop onto said screen, an exhaust duct terminating adjacent said screen, means for causing an air current to pass through the particles of material falling from said pan to said screen whereby the dust and finer particles are removed therefrom, and a separation chamber associated with said duct and provided with baffles for directing the air currents downwardly whereby the larger particles are caused to fall at the bottom of said chamber, and means for re-admitting said larger particles into said duct.

In testimony whereof I have hereunto set my hand.

LOUIS D. PEIK. 

